There are many details involved to check the set. The process is beyond the practicality of an email.

You will need the service manual, a DVM, and depending on the circumstances you will need a scope.

The service manual may still be available from Sony.

Most of the time in these models of set, this type of fault is a failure in the scan amplifier sections; mainly in the horizontal output section. If this is the case, there may also be some damage in the power supply.

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Related Questions:

Seven blinks - High voltage shutdown. The high
voltage has exceeded 33k and the unit goes immediately into safety shutdown.
Check power supply regulation and horizontal circuits.To
get more details, http://electronicshelponline.blogspot.com/

Seven
blinks - High voltage shutdown. The high voltage has exceeded 33k and the unit
goes immediately into safety shutdown. Check power supply regulation and
horizontal circuits.As you can see here, seven blinks of standby light is due to some over voltate at the final anode of the picture tube. This is a protection process that going on insde the tV circuits, to prevent more damage to other comnponents on board. The most common cause for this is with the main power regulator out voltage itself. If any way, it ahs exceeded 135VDC, this kind of fault will occur. Check the main power regulator section circuit for any damaged component/s. Replace all the small electrolytic capacitors there. Visit the site named 'Electro-help' for
more details.Check this LINK and select the
site named above.View it in'Flip card' option, which can be selected
from the drop down box menu at the left top corner or the display window. It
will make search easy. Some times, the ads attached with each posts might help
you to find the availability of spare parts. There are more than 550 posts to
different brand TVs.Blinking codes and
details are there.

Continuous blink once a second, no pausing - No reply from the jungle IC301 (data bus is busy, shorted to ground, or held high), IK video path is defective.

One blink - not used for the self-diagnosis

Two blinks - B+ over current protection (OCP), unit goes to the standby mode then displays the 2 blink fault. Could be a short in the power supply of any of the circuits.

Three blinks - B+ over voltage protection (OVP), unit goes to the standby mode then displays the 3 blink fault. This is also a problem in the power supply circuit, check T603 and R672.

Four blinks - No vertical Deflection (V STOP), Screen goes to a single horizontal line then the video signal muted. Check IC1509, Q1505

Five blinks - AKB circuit (automatic kine bias), the timer/standby indicator blinks for about 30 seconds then goes to the self-diagnosis function. Something is wrong with the video. Check video out, Q705, 732, 761 and other components on the C board, also check Q218, 219, 220 on the A board. In addition, unit could be in IK blanking, try turning up screen slightly.

Seven blinks - High voltage shutdown. The high voltage has exceeded 33k and the unit goes immediately into safety shutdown. Check power supply regulation and horizontal circuits.

Eight blinks - Problem with the audio (AUDIO), unit goes to standby and blinks the self-diagnosis code. Check IC406audio amp, PS401, and 402. On some projection models of Sony TV sets, this code means that T8005 (flyback transformer), or the associative components in the high voltage circuits are defective on the D board.

Nine blinks - Replace D 6116 and D 6301 on the "G" board, do not resolder as this will fix the problem temporary. Or Panel Module Error or Thermal Error. If it is intermittent 9 blinks, meaning sometimes the TV comes on and other times you get flashing, then change the switching regulator on the "G" board or check connections. Make sure the regulator is -12 or -13 (negitive).

Ten blinks - Check Q8014 and Q8013 for shorts, leakage, or bad solder connections on the " D" board. If the transistors are bad, check R8051 and IC8005, also on the "D" board.

Seven blinks = High voltage shutdown (overcurrent protection). The high voltage has exceeded 33k and the unit goes immediately into safety shutdown. Check power supply regulation and horizontal circuits, otherwise send the TV to a workshop for a quote on likely parts and labour costs, then make a decision afterwards about whether it is economical to repair or not.

Usually it is either the flyback transformer, the tuning capacitors in the collector circuit of the horizontal output transistor(s) as well as the transistor(s) which could be faulty. These parts should be replaced at the same time.

Continuous blink once a
second, no pausing - No reply from the jungle IC301 (data
bus is busy, shorted to ground, or held high), IK video path is
defective.

One blink - not
used for the self-diagnosis

Two
blinks - B+ over current protection (OCP), unit goes to the
standby mode then displays the 2 blink fault. Could be a short in
the power
supply of any of the circuits.

Three blinks - B+
over voltage protection (OVP), unit goes to the standby mode then
displays the 3 blink fault. This is also a problem in the power
supply circuit, check T603 and R672.

Four blinks - No
vertical Deflection (V STOP), Screen goes to a single horizontal
line then the video signal muted. Check IC1509, Q1505

Five blinks - AKB
circuit (automatic kine bias), the timer/standby indicator blinks
for about 30 seconds then goes to the self-diagnosis function.
Something is wrong with the video. Check video out, Q705, 732, 761
and other components on the C board, also check Q218, 219, 220 on
the A board. In addition, unit could be in IK blanking, try turning
up screen slightly.

Seven blinks - High voltage shutdown. The
high voltage has exceeded 33k and the unit goes immediately into
safety shutdown. Check power supply regulation and horizontal
circuits.

Eight blinks - Problem with
the audio (AUDIO), unit goes to standby and blinks the
self-diagnosis code. Check IC406 audio amp, PS401, and 402. On some
projection models of Sony TV sets, this code means that T8005
(flyback
transformer), or the associative
components in the high voltage circuits are defective on the D
board.

Nine blinks - Replace D 6116 and D 6301 on
the "G" board, do not resolder as this will fix the
problem temporary. Or Panel Module Error or Thermal Error. If it is
intermittent 9 blinks, meaning sometimes the TV comes on and other
times you get flashing, then change the switching regulator on the
"G" board or check connections. Make sure the regulator is
-12 or -13 (negitive).

Ten blinks - Check Q8014 and Q8013 for
shorts, leakage, or bad solder connections on the " D"
board. If the transistors are bad, check R8051 and IC8005, also on
the "D" board.

Hi,
Seven blink indicates that there is a high voltage shutdown. The high voltage has exceeded 33k and the unit goes immediately into safety shutdown. Check power supply regulation and horizontal circuits.

Hi,
Seven blink indicates high voltage shutdown. The high voltage has exceeded 33k and the unit goes immediately into safety shutdown. Check power supply regulation and horizontal circuits.Also it can be due to bad flyback.